Date: Mon, 2 Oct 2017 21:29:56 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Adam Vande More <amvandemore@gmail.com>, Ben RUBSON <ben.rubson@gmail.com> Cc: Freebsd fs <freebsd-fs@freebsd.org> Subject: Re: ZFS stalled after some mirror disks were lost Message-ID: <59D293B4.2020702@quip.cz> In-Reply-To: <CA%2BtpaK2=du8Ghrz9N4sfBk2T4tAC9NEdwOoHV3CQz5DOKcMogw@mail.gmail.com> References: <4A0E9EB8-57EA-4E76-9D7E-3E344B2037D2@gmail.com> <CA%2BtpaK2=du8Ghrz9N4sfBk2T4tAC9NEdwOoHV3CQz5DOKcMogw@mail.gmail.com>
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Adam Vande More wrote on 10/02/2017 20:44: > On Mon, Oct 2, 2017 at 1:12 PM, Ben RUBSON <ben.rubson@gmail.com> wrote: > >> Hi, >> >> On a FreeBSD 11 server, the following online/healthy zpool : >> >> home >> mirror-0 >> label/local1 >> label/local2 >> label/iscsi1 >> label/iscsi2 >> mirror-1 >> label/local3 >> label/local4 >> label/iscsi3 >> label/iscsi4 >> cache >> label/local5 >> label/local6 >> >> A sustained read throughput of 180 MB/s, 45 MB/s on each iscsi disk >> according to "zpool iostat", nothing on local disks (strange but I >> noticed that IOs always prefer iscsi disks to local disks). >> No write IOs. >> >> Let's disconnect all iSCSI disks : >> iscsictl -Ra >> >> Expected behavior : >> IO activity flawlessly continue on local disks. >> > > Perhaps I'm misunderstanding your setup, but my expected behavior would be > exactly what you see. I think you'd need something more along the lines of: > > home > mirror > label/local1 > label/iscsi1 > mirror > label/local2 > label/iscsi2 > etc... The OP has four way mirror. It is supposed to work even if 3 devices are missing. Just 1 device should be enough. Miroslav Lachman
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